3949981547 has 2 divisors, whose sum is σ = 3949981548. Its totient is φ = 3949981546.

The previous prime is 3949981513. The next prime is 3949981571. The reversal of 3949981547 is 7451899493.

3949981547 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3949981547 - 2²⁰ = 3948932971 is a prime.

It is not a weakly prime, because it can be changed into another prime (3949981577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1974990773 + 1974990774.

It is an arithmetic number, because the mean of its divisors is an integer number (1974990774).

Almost surely, 2^3949981547 is an apocalyptic number.

3949981547 is a deficient number, since it is larger than the sum of its proper divisors (1).

3949981547 is an equidigital number, since it uses as much as digits as its factorization.

3949981547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9797760, while the sum is 59.

The square root of 3949981547 is about 62848.8786455256. The cubic root of 3949981547 is about 1580.7566672945.

The spelling of 3949981547 in words is "three billion, nine hundred forty-nine million, nine hundred eighty-one thousand, five hundred forty-seven".